The world is an arena where we came to perform some actions. The actions need training. But this training is a continuous process. A child, when starts to learn, he learns as per instruction. Similar is for animals. After this learning, an animal learns something only for survival purpose. But humans do not learn only for survival. They seek knowledge as a basic need. Sometimes they also realise something without any teacher or instruction or necessity but through their life experiences. This self-realisation is wisdom which is worth of any valuable gem.